Patents by Inventor David W. Keith

David W. Keith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Double gusseted tamper evident slider bag
    Publication number: 20030185466
    Abstract: A double gusseted, tamper evident, reclosable container 120 of plastic film. The container can be stored in a flat condition but is capable of receiving a bulky item such as a loaf of bread or a stack of paper napkins with the bag assuming a squared off condition. The container 120 has two gussets 185 and 191.
    Type: Application
    Filed: March 28, 2003
    Publication date: October 2, 2003
    Inventors: Paul F. Edelman, David W. Keith
  • Matter wave optical systems in which an atomic beam intersects a diffraction grating at a grazing incidence
    Patent number: 4886964
    Abstract: The optical system includes a matter diffraction grating and an atomic beam intersecting the grating at a grazing angle of incidence. The grazing incidence angle should be less than 10.sup.-2 radians. At such shallow angles of incidence, neutral atomic beams are diffracted by conventional diffraction gratings. A suitable grating has a local flatness of 10 Angstroms and has 2400 lines per millimeter. Preferred embodiments include interferometers, beam splitters and combiners, and velocity selectors.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: December 12, 1989
    Assignee: Massachusetts Institute of Technology
    Inventors: David E. Pritchard, David W. Keith